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为提高CO2跨临界循环效率,对现有的气体冷却器采用分布参数模型进行研究。分析不同工质管管数时的换热器换热效果。模拟结果表明,随着管数增加,CO2侧换热系数增加,水侧换热系数减小。管数为3时平均换热系数最大。换热系数的变化主要是由不同管径下的流速决定的,管数越多,CO2侧流速越大,水侧流速越小。实验结果与计算结果对比可知,水侧出口温度偏差在7.5%以内,CO2出口温度偏差在15%以内。
In order to improve the transcritical CO2 efficiency, the existing gas cooler is studied by using the distributed parameter model. Analysis of different working tube when the heat exchanger heat exchanger effect. The simulation results show that as the tube number increases, the heat transfer coefficient on the CO2 side increases and the heat transfer coefficient on the water side decreases. When the number of tubes is 3, the average heat transfer coefficient is the largest. The change of the heat transfer coefficient is mainly determined by the flow rate under different pipe diameters. The more the number of pipes, the larger the flow rate on the CO2 side and the smaller the flow rate on the water side. The experimental results and calculated results show that the deviation of water outlet temperature within 7.5%, CO2 outlet temperature deviation within 15%.